<!DOCTYPE html>
<html>
	<head>
         <meta charset="UTF-8">
         <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css" integrity="sha384-xOolHFLEh07PJGoPkLv1IbcEPTNtaed2xpHsD9ESMhqIYd0nLMwNLD69Npy4HI+N" crossorigin="anonymous">
    <!-- 最新的 Bootstrap 核心 JavaScript 文件 -->
    <script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-Fy6S3B9q64WdZWQUiU+q4/2Lc9npb8tCaSX9FK7E8HnRr0Jz8D6OP9dO5Vg3Q9ct" crossorigin="anonymous"></script>
		
		<title></title>
	</head>
	<body>
        <nav class="navbar navbar-expand-lg navbar-light bg-blue btn btn-primary">
            <a class="text-white navbar-brand" href="#"  >首页</a>
            <button class=" navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
              <span class="navbar-toggler-icon"></span>
            </button>
          
            <div class="collapse navbar-collapse" id="navbarSupportedContent">
              <ul class="navbar-nav mr-auto">
                <li class="nav-item active">
                  <a class="text-white nav-link" href="#">我的 <span class="sr-only">(current)</span></a>
                </li>
                <li class="nav-item">
                  <a class=" nav-link" href="#">设置</a>
                </li>
                <li class="nav-item dropdown">
                  <a class=" nav-link dropdown-toggle" href="#" role="button" data-toggle="dropdown" aria-expanded="false">
                    更多
                  </a>
                  <div class="dropdown-menu">
                    <a class="dropdown-item" href="#">Action</a>
                    <a class="dropdown-item" href="#">Another action</a>
                    <div class="dropdown-divider"></div>
                    <a class="dropdown-item" href="#">Something else here</a>
                  </div>
                </li>
                <li class="nav-item">
                  <a class=" nav-link disabled">退出</a>
                </li>
              </ul>
              <form class="form-inline my-2 my-lg-0">
                <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
                <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
              </form>
            </div>
          </nav>
        <div class="mb-3">
          &nbsp;  &nbsp; &nbsp;<label for="formGroupExampleInput" class="form-label">账号</label>
          &nbsp;  &nbsp; &nbsp;<input type="text" class="form-control" id="formGroupExampleInput" placeholder="请输入账号">
            </div>
            <div class="mb-3">
                &nbsp;  &nbsp; &nbsp;<label for="formGroupExampleInput2" class="form-label">密码</label>
               <input type="text" class="form-control" id="formGroupExampleInput2" placeholder="请输入密码">
            </div>
            <div class="form-floating"> 
                &nbsp;<label for="formGroupExampleInput2" class="form-label">选择登录</label><br/>

                &nbsp;<select class="form-select" id="floatingSelect" aria-label="Floating label select example">
               
                <option value="1" class="form-control" id="formGroupExampleInput2">移动登入</option>
                <option value="2" class="form-control" id="formGroupExampleInput2">联通登入</option>
                <option value="3" class="form-control" id="formGroupExampleInput2">电信登入</option>
                </select><br/>
                <br/>
                <button type="button" class="btn btn-primary">登入</button>
              
                </div>

	</body>
</html>
